How to get drive list in c#

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Shapes;

using System.IO;

namespace WpfApplication1

{

    /// <summary>

    /// Interaction logic for Window4.xaml

    /// </summary>

    public partial class Window4 : Window

    {

        public Window4()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, RoutedEventArgse)

        {

            DriveInfo[] strdrives = DriveInfo.GetDrives();

            foreach (DriveInfo strdrive in strdrives)

            {

                listBox1.Items.Add(strdrive);

            }

        }

    }

}